太陽能電池鑄造用二氧化矽石英坩鍋之製造研究

本研究係利用注漿成型法(Slip casting)之製程，進行未添加分散劑（固含量46 vol%）與添加檸檬酸分散劑（固含量53 vol%）之太陽能電池鑄造用二氧化矽石英坩堝燒結性質之研究。在未添加分散劑之二氧化矽粉體漿料，經過球磨後pH值由最初的4.6降為3.8，脫膜後之胚體透過1250~1450°C之不同的燒結溫度，分別進行1、2以及4小時不同燒結時間，經過球磨後pH值由最初的4.6降為3.8，其體密度以及結晶相，接近於太陽能電池鑄造用二氧化矽石英坩堝之規格（體密度大於1.95 g/立方公分、結晶度小於1%），但是孔隙度為15~22%，不能達到石英坩堝小於12%之規格，無法達到太陽能電池鑄造用石英坩堝的要求。添加檸檬酸分散劑之二氧化矽胚體燒結，不同含量之檸檬酸分散劑0.3wt%、0.5wt%與0.8wt%，在1150~1350°C之不同燒結溫度與燒結時間4小時下，可達到接近於太陽能電池鑄造用二氧化矽石英坩堝之規格，其中以檸檬酸分散劑0.3~0.5wt%、燒結溫度1250~1300℃、燒結時間4小時之條件下，較為適合應用於太陽能電池鑄造用二氧化矽石英坩鍋之規格，而添加檸檬酸分散劑更有助於燒結體的緻密性。

關鍵字

注漿成型；二氧化矽；石英坩堝；分散劑

並列摘要

Study on manufacture of silica quartz crucible for solar cell casting was investigated by slip casting in two different methods without dispersant (solid content 46 vol%) and citric acid dispersant (solid-content 53 vol%). After milling, the pH value of SiO2 powder slurry was decreased from 4.6 to 3.8. The SiO2 samples after demolding were sintered without dispersant at 1250~1450°C sintering temperature and at 1, 2 and 4 hours sintering time, respectively. The bulk density and crystal phase closed to the specifications of silica quartz crucible for solar cell casting (bulk density＞1.95 g/cm^3, crystal phase＜1%), but 15~22% porosity was not to meet the specifications of silica quartz crucible for solar cell casting (porosity＜12%). The SiO2 samples added 0.3 wt%, 0.5 wt% and 0.8 wt% citric acid dispersant at 1150~1350℃ and 4 hours sintering time closed to the specifications of silica quartz crucible for solar cell casting. All samples with citric acid dispersant 0.3~0.5 wt% at 1250~1300℃ sintering temperature and 4 hours sintering time were suitable for processes of silica quartz crucible for solar cell casting. However, quartz crucibles with citric acid dispersant were enhanced the denseness of sintered samples.

並列關鍵字

Slip casting ； Silica ； Quartz crucible ； Dispersant

國際替代計量

太陽能電池鑄造用二氧化矽石英坩鍋之製造研究

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